Introduction

VOPlot (VOTable Plotting tool) is an applet for plotting different astronomical graphs using data stored in VOTable format. VOPlot is available in desktop version and a web-based version. The web-based version is integrated with the VizieR Catalogue Service and can be used to plot any catalogue by selecting output layout as "Plot (VOPlot)". The desktop version can be downloaded from http://vo.iucaa.ernet.in/~voi/voplot.htm.

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About VOPlot

VOPlot has been developed as a part of the Virtual Observatory - India initiative by Persistent Systems Ltd. and the Inter-University Centre for Astronomy and Astrophysics (IUCAA), in collaboration with Centre de Données astronomiques de Strasbourg (CDS), with a support from the European AVO project. The collaboration between VO-I and CDS extends to several related projects.

VOPlot uses Ptplot 5.2, a 2D data plotter and histogram tool implemented in Java. Ptplot has been developed at EECS department at the University of California, Berkeley.

VOPlot uses SAXParser to parse VOTable documents.

Third Party Tools

1. Ptplot 5.2, a 2D data plotter and histogram tool implemented in Java. Ptplot has been developed at EECS department at the University of California, Berkeley.
2. VOPlot makes use of cds.astro (Astronomical coordinate manipulation) package for projection maps. The package has been developed by CDS, Strasbourg.
3. VOPlot makes use of Aladin which is an interactive software tool allowing the user to visualize digitized images of any part of the sky, to superimpose entries from astronomical catalogs. It is developed by CDS, Strasbourg.
4. VOPlot uses Colt package of CERN libraries for statistical calculations of the VOTable data.

Differences in Desktop and Web-based VOPlot

The desktop version has same functionality as the web-based version except for a feature for saving the plot as an EPS file or as a VOTable file.  In the web-based version, there is no menu to load a VOTable, Ascii or FITS file.